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Hello everyone, What pressure value (Design Pressure or Maximum Allowable Working Pressure) should be used to calculate vessel's post construction minimum required thickness (Tmin)? If proving an example helps the understanding of the question, let's say that after reviewing the vessel...

Hello all! My understanding is that JE is the ratio of the strength of joint to the strength of the base material. I've been trying to find out how the Joint Efficiency (JE) values were determined by ASME? For example, how did ASME determined that for a Type 1 joint without radiography the JE...

Hello everyone, Have the allowable stress values in ASME B31.3 changed along with the release of the different editions of this code? Can any of you route or guide me towards a historical reference or table where I can see the changes of the allowable stress values in time with the release of...

Hi Gents, The code 30 CFR 250.804 (now 880, or about to change) is stating that we need to test our PSVs every 12 months, which put us on a difficult situation. This code is governed by BSEE and only applies to the US portion of the Gulf of Mexico. Are any of you familiar with this code and/or...

Hello everyone, I work for a company in the Middle East and there are a series of Heat Exchangers in my facilities that were originally design to operate under certain conditions that are not longer valid as the gas wells that feed the system where they are installed in have declined. The...

Good morning Gentlemen, The situation is as follow: - Glycol Absorber Column in a Gas Dehydration Unit operating at 1100 psi and 40 Celsius degrees - Service: Wet Gas with around 400 ppm H2S - Commissioned in 1979, over 35 years in continue operation - Material of Construction: SA-516-70 - No...

Good day for all... I have a very experienced colleague in the refinery I work on that is affirming that Solid State Transformations also cause thickness reduction. Is this affirmation correct? The situation is that we have a failure in one steam generator tube (convection section) and the...

Good morning all, We stripped down the Glycol Reboiler Firetube as a part of the scheduled Gas Deshydration Unit Turnaround. We found the Firetube of the reboiler covered of a thick layer of deposits on the top half of the firetube. Once we proceeded removing the deposits we found a cracked...

Hi everyone! I hope everybody is doing fine. This is a Gas Lift Line (dry gas, or at least it is described as dry gas) that was remove from service for installing Wear Pads in some locations. After the welding of one of the weld pad we conducted hydrotest and we found the pipe leaking in one...

Hi everyone! I have this situation. A 10" ball valve is installed just after and 90degrees elbow in a piping arrangement. Is there any specification/restriction for this type of arrangement? Please find the picture attached. Kind regards and thank you very much in advance for your...

Hi Gents! Does any body know where the values for Severity Index used for calculating the Damage Factors come from? What is the supporting theory behind these numbers? Please see attached picture for an example of these values I am talking about. Essentially my question would be: what is the...

Hi Gents, This is the case: 2" Pipeline SCH 80 API 5L Gr B. The system is rated at #600. The length of this pipeline is about 800 meters. This system was undergoing a hydrotest as a part of the construction process. The test pressure was set at 2175 psi (company standard fro test pressure on...

Hi Gents, I have to hydrotest the tubes of a Fin Fan Cooler and what came first to my mind was the API-510 criterion of 1.3 x MAWP x the Correction for Temperature (S Test Tem / S Des Temp). The equipment has 5 years in service and 8 of its tubes have leaked. We have plugged the tubes out and...

Hi Gents, I have been provided of a WPS and its respective supporting PQR. The qualified BM thickness range is shown in the WPS as 3/16" - 2" and Pipe 6" - Unlimited. PQR is showing test coupon of 1". Does plate test coupon qualifiy a WPS also for pipe? I went through the code and I couldn't...

Hello everyone, I have this issue. We are under the commissioning process of one Gas Dehydration Unit. 6 months ago we started to conduct some tests in the unit as a part of the commissioning process and after two days testing the unit at the operating conditions we realized that we had a...

Hi everyone, I went through this thread (http://www.eng-tips.com/viewthread.cfm?qid=25516#post)and something came to my mind as a question: In ASME Sec. VIII Div. 1 - UG-25(e) it is mentioned that Telltale holes shall not be used for vessel that are to contain lethal substances. In this case...

Hello everybody! I am new in this forum, and also kind of new in this Pressure Vessel field. I have a question regarding the Nozzle Neck minimum required thickness for an in-service vessel. What is UG-45 table based on? are those values considering structural loads for the nozzle itself? What...